Simulator to work with succinct hash delegations

Change RepositorySimulator.add_delegations() to work with delegated
role "role" that uses succinct hash delegations.
This case is special as for that role we are not creating one target,
but we are creating target metadata instances for all bins.

Signed-off-by: Martin Vrachev <[email protected]>

tests/repository_simulator.py

@@ -346,7 +346,10 @@ def add_target(self, role: str, data: bytes, path: str) -> None:
         self.target_files[path] = RepositoryTarget(data, target)
 
     def add_delegation(
-        self, delegator_name: str, role: DelegatedRole, targets: Targets
+        self,
+        delegator_name: str,
+        role: DelegatedRole,
+        targets: Optional[Targets],
     ) -> None:
         """Add delegated target role to the repository."""
         if delegator_name == Targets.type:
@@ -359,20 +362,31 @@ def add_delegation(
             delegator.delegations = Delegations({}, {})
 
         role_name: str = role.name if role.name is not None else ""
+        key, signer = self.create_key()
+
         if role.succinct_hash_info:
+            # Add target metadata for all bins.
+            for delegated_name in role.succinct_hash_info.get_all_bin_names():
+                self.md_delegates[delegated_name] = Metadata(
+                    Targets(expires=self.safe_expiry)
+                )
+
+                self.add_signer(delegated_name, signer)
+
             role_name = role.succinct_hash_info.get_bin_name()
 
+        else:
+            # By default add one new key for the role
+            self.add_signer(role_name, signer)
+
+            # Add metadata for the role
+            if targets is not None:
+                if role_name not in self.md_delegates:
+                    self.md_delegates[role_name] = Metadata(targets)
+
         # put delegation last by default
         delegator.delegations.roles[role_name] = role
-
-        # By default add one new key for the role
-        key, signer = self.create_key()
         delegator.add_key(role_name, key)
-        self.add_signer(role_name, signer)
-
-        # Add metadata for the role
-        if role_name not in self.md_delegates:
-            self.md_delegates[role_name] = Metadata(targets, {})
 
     def write(self) -> None:
         """Dump current repository metadata to self.dump_dir